How many days since last Asteroid Day 2025

×

Asteroid Day 2025 Countdown details

It's been 340 days since Asteroid Day 2025 on Monday, 30 June 2025.

• 📅 340 days
• 📅 48 weeks and 4 days
• 🕐 8160 hours
• 🚀 113 trips to the Moon

About Asteroid Day 2025

Asteroid Day is a United Nations-sanctioned global awareness campaign held every year on June 30th, marking the anniversary of the 1908 Tunguska event — the largest asteroid impact in recorded history, which flattened 2,200 square kilometres of Siberian forest. Co-founded in 2014 by Stephen Hawking, astronaut Rusty Schweickart, Queen guitarist and astrophysicist Brian May, and others, it brings together scientists, educators, and citizens to highlight the importance of planetary defence. Count down the days until Asteroid Day with our live countdown timer.

Next & Previous

Related Countdowns to Asteroid Day 2025

When is Asteroid Day 2025?

See dates for Asteroid Day 2025 in other years.

When is Asteroid Day 2025? →

Frequently Asked Questions about Asteroid Day 2025

Is it Asteroid Day today?

Find out if it's Asteroid Day today →

Customise

Change the background image, countdown format, and add effects like snow.

Open Settings

Share Asteroid Day 2025 countdown

Share this countdown →

All times shown in timezone.